Question

A tennis ball of mass 58g is thrown 5m into the air before served. Calculate the velocity of the tennis ball just before it is hit with the tennis racket.

Answer 1

We have to know how high the racket is when it hits the ball.
Maybe 3 meters?
if so the ball falls 2 meters from 5 meters to 3 meters
2 = 4.9 t^2
t = .639 seconds
v = g t = 9.8*.639 = 6.26 m/s
does not matter if on the way up or on the way down, same magnitude due to symmetry

Answer 2

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Answer 3

V^2 = Vo^2 + 2g*h.
V^2 = 0 + 19.6*5,
V = 9.90 m/s.

Note: It is assumed that the ball was hit at the same ht. it was released.